First off, for the record 100mil is not a set price on it. That is just what was initially suggest (Sorry, I can't remember the name of who suggested it first atm)
As for a "time out" isn't that already implied with the player death rule that eliminates you from combat when you die? A license would not negate that rule, by any means.
I do think that all the caps should require a license, but they should have different ones... (These are the prices that I think are appropriate, and are up for discussion, obviously lol)
Gunboat License - 5 Mil
Cruiser License - 10 Mil
Battleship License - 100mil